Broken Shore is reminiscent of Tanaan Jungle
and Timeless Isle, but its content is unlocked
more gradually. The zone also contains the Tomb of Sargeras raid and the
Cathedral of Eternal Night dungeon.

After speaking to Archmage Khadgar at Krasus Landing in Dalaran, you will
begin a scenario that serves as a prelude to the Armies of Legionfall and the Broken
Shore. Once the scenario is completed, you will unlock Broken Shore World Quests
and gain initial reputation with the Armies of Legionfall.

1. Nethershards

Nethershards can be earned mostly from Broken Shore
world quests, invasions, the Sentinax, or looted from rare elites
and containers on the Broken Shore.

2. Broken Shore Buildings

Deliverance Point will be your main foothold, where you will contribute
Legionfall War Supplies (obtained mainly from Broken Shore World Quests
and rare Elites) by batches of 100 in order to construct structures that grant various perks
(including activating new content).
Contributions are a cross-faction, region-wide effort.

As you can see, there are 3 buildings (Mage Tower, Command Center, and
Nether Disruptor). Each building has a permanent perk (i.e., a perk that is enabled for everyone)
and a secondary random perk that changes every time the building is rebuilt. In
order to benefit from the perks, players need to speak with Commander Chambers
every time a building is rebuilt.

Once a building is completed, the Legion will periodically attack it,
eventually destroying it. Perks are disabled when the buildings are destroyed.
There is a 1-day cooldown period before a destroyed building can be rebuilt.

The Deliverance Point building accumulation rate has been increased for all regions.
The intended result is for buildings to complete at approximately the same rate
as they did before Patch 7.3.
(Source).

2.1. Mage Tower

The permanent perk of the Mage Tower is Fel Treasures. It activates the
following content: Artifact Challenges, Veiled Wyrmtongue Chests,
and Portal Network.

Artifact Challenges:The Council of Six provide access to a series of unique challenges,
allowing worthy heroes to test their might and skill.

This is single-player content that allows you to test out your skills
against a mighty opponent. If you succeed, you will unlock new Artifact
appearances for your specialization. It costs Nethershards to purchase
additional chances at the encounter. There is a total of 7 challenges per
specialization.

Veiled Wyrmtongue Chests:The power of the Mage Tower pulses across the
Broken Shore, revealing the lucrative Veiled Wyrmtongue Chests.

Veiled Wyrmtongue Caches are shared containers that spawn at random locations
whenever the Mage Tower is up (not to be confused with Curious Wyrmtongue Caches).

Portal Network:The Kirin Tor provide access to portals which
can be used to move quickly around the Broken Isles.

Inside the Mage Tower, you will find portals to move between zones across
the Broken Isles (Azsuna, Highmountain, Val'sharah, Stormheim).

2.1.1. Random Perk

Knowledgeable — When you loot an item which grants Artifact
Power in a Raid or Dungeon, there is a chance that you will receive a bonus
Artifact Power token.

Seal Your Fate — Each day the Nether Disruptor is active, you
can return to the Broken Shore to complete a quest that grants you a free
Seal of Broken Fate (that can go beyond the standard limit of 3 Seals per week).

3. Treasure Master Iks'reeged

Treasure Master Iks'reeged is unlocked after completing the quest line
started by Spiders, Huh?. He can be found in a secret cave that can be accessed
by clicking the Peculiar Rope found at 47,67, as shown in the image below:

Before Patch 7.3, you were able to purchase Relinquished Tokens
from Thaumaturge Vashreen, at a cost of 5,000 Nethershards per
token. These tokens had a chance to contain a Legendary item appropriate for
your loot specialization, with a base item level of 880. These tokens are the
World of Warcraft equivalent of Kadala gambling in Diablo 3.

5. Crafted Legendary Items

The new crafted legendary items are of medium strength, when compared to the other
legendary items:

Note that they do not reset or influence bad luck protection in any way.

If you have Tailoring, Leatherworking, or Blacksmithing maxed out when the Nether
Disruptor is built, you will receive a Armorcrafter's Commendation from
The Nether Disruptor quest. With this item in your bags, you can go and speak to
Eliezer Hammerbeard at Deliverance Point to start the Fashion History and a Philosophy of Style
quest, which serves as an introductory quest for all crafted legendary quests. From there
on, you will be given different quests to complete, depending on your profession, before
you can craft the new crafted legendary items.

6. The Sentinax

The Sentinax is a Legion battleship cruising the Broken Shore (it periodically changes its location) and attacking
the area beneath it. Enemies beneath the Sentinax have a chance to drop
beacons that are used to cause the Sentinax to open portals, which spawn more
difficult creatures. When killed, the creatures drop Nethershards, crafting
materials and even more powerful beacons that can be used to summon more
challenging foes and provide better loot. Hence, several types of beacons can
be dropped with increasing difficulty.

Sentinax Beacon of the Bloodstrike, which causes the Sentinax to fire a Bloodstrike at
your current location. It deals 160% of your maximum Health as Chaos damage over 4 seconds,
unearthing Blood of Sargeras. You need to survive through the damage in order
to be able to collect it (personal cooldowns are advised).

7. Achievements

We counted 10 achievements linked to the Broken Shore. They are all self-explanatory, so we
simply list them here.